<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ page import="java.util.*,java.io.*" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="org.json.simple.*" %>
<%

    /**
     * KindEditor JSP
     *
     * 本JSP程序是演示程序，建议不要直接在实际项目中使用。
     * 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。
     *
     */

//根目录路径，可以指定绝对路径，比如 /var/www/attached/
    String rootPath = pageContext.getServletContext().getRealPath("/") + "attached/";
//根目录URL，可以指定绝对路径，比如 http://www.yoursite.com/attached/
    String rootUrl = request.getContextPath() + "/attached/";
//图片扩展名
    String[] fileTypes = new String[]{"gif", "jpg", "jpeg", "png", "bmp"};

    String dirName = request.getParameter("dir");
    if (dirName != null) {
        if (!Arrays.<String>asList(new String[]{"image", "flash", "media", "file"}).contains(dirName)) {
            out.println("Invalid Directory name.");
            return;
        }
        rootPath += dirName + "/";
        rootUrl += dirName + "/";
        File saveDirFile = new File(rootPath);
        if (!saveDirFile.exists()) {
            saveDirFile.mkdirs();
        }
    }
//根据path参数，设置各路径和URL
    String path = request.getParameter("path") != null ? request.getParameter("path") : "";
    String currentPath = rootPath + path;
    String currentUrl = rootUrl + path;
    String currentDirPath = path;
    String moveupDirPath = "";
    if (!"".equals(path)) {
        String str = currentDirPath.substring(0, currentDirPath.length() - 1);
        moveupDirPath = str.lastIndexOf("/") >= 0 ? str.substring(0, str.lastIndexOf("/") + 1) : "";
    }

//排序形式，name or size or type
    String order = request.getParameter("order") != null ? request.getParameter("order").toLowerCase() : "name";

//不允许使用..移动到上一级目录
    if (path.indexOf("..") >= 0) {
        out.println("Access is not allowed.");
        return;
    }
//最后一个字符不是/
    if (!"".equals(path) && !path.endsWith("/")) {
        out.println("Parameter is not valid.");
        return;
    }
//目录不存在或不是目录
    File currentPathFile = new File(currentPath);
    if (!currentPathFile.isDirectory()) {
        out.println("Directory does not exist.");
        return;
    }

//遍历目录取的文件信息
    List<Hashtable> fileList = new ArrayList<Hashtable>();
    if (currentPathFile.listFiles() != null) {
        for (File file : currentPathFile.listFiles()) {
            Hashtable<String, Object> hash = new Hashtable<String, Object>();
            String fileName = file.getName();
            if (file.isDirectory()) {
                hash.put("is_dir", true);
                hash.put("has_file", (file.listFiles() != null));
                hash.put("filesize", 0L);
                hash.put("is_photo", false);
                hash.put("filetype", "");
            } else if (file.isFile()) {
                String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                hash.put("is_dir", false);
                hash.put("has_file", false);
                hash.put("filesize", file.length());
                hash.put("is_photo", Arrays.<String>asList(fileTypes).contains(fileExt));
                hash.put("filetype", fileExt);
            }
            hash.put("filename", fileName);
            hash.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
            fileList.add(hash);
        }
    }

    if ("size".equals(order)) {
        Collections.sort(fileList, new SizeComparator());
    } else if ("type".equals(order)) {
        Collections.sort(fileList, new TypeComparator());
    } else {
        Collections.sort(fileList, new NameComparator());
    }
    JSONObject result = new JSONObject();
    result.put("moveup_dir_path", moveupDirPath);
    result.put("current_dir_path", currentDirPath);
    result.put("current_url", currentUrl);
    result.put("total_count", fileList.size());
    result.put("file_list", fileList);

    response.setContentType("application/json; charset=UTF-8");
    out.println(result.toJSONString());
%>
<%!
    public class NameComparator implements Comparator {
        public int compare(Object a, Object b) {
            Hashtable hashA = (Hashtable) a;
            Hashtable hashB = (Hashtable) b;
            if (((Boolean) hashA.get("is_dir")) && !((Boolean) hashB.get("is_dir"))) {
                return -1;
            } else if (!((Boolean) hashA.get("is_dir")) && ((Boolean) hashB.get("is_dir"))) {
                return 1;
            } else {
                return ((String) hashA.get("filename")).compareTo((String) hashB.get("filename"));
            }
        }
    }

    public class SizeComparator implements Comparator {
        public int compare(Object a, Object b) {
            Hashtable hashA = (Hashtable) a;
            Hashtable hashB = (Hashtable) b;
            if (((Boolean) hashA.get("is_dir")) && !((Boolean) hashB.get("is_dir"))) {
                return -1;
            } else if (!((Boolean) hashA.get("is_dir")) && ((Boolean) hashB.get("is_dir"))) {
                return 1;
            } else {
                if (((Long) hashA.get("filesize")) > ((Long) hashB.get("filesize"))) {
                    return 1;
                } else if (((Long) hashA.get("filesize")) < ((Long) hashB.get("filesize"))) {
                    return -1;
                } else {
                    return 0;
                }
            }
        }
    }

    public class TypeComparator implements Comparator {
        public int compare(Object a, Object b) {
            Hashtable hashA = (Hashtable) a;
            Hashtable hashB = (Hashtable) b;
            if (((Boolean) hashA.get("is_dir")) && !((Boolean) hashB.get("is_dir"))) {
                return -1;
            } else if (!((Boolean) hashA.get("is_dir")) && ((Boolean) hashB.get("is_dir"))) {
                return 1;
            } else {
                return ((String) hashA.get("filetype")).compareTo((String) hashB.get("filetype"));
            }
        }
    }
%>